UNITED STATES, [US]--If a natural disaster, terrorist attack, or other unforeseen apocalypse hits the US, doomsday preppers will be ready. They've already been stockpiling food, buying water filters, and hatching escape plans — in some cases for years. Recently, preppers seem to have found another reason for concern: Donald Trump's election. At least a handful of American prepping supply companies have seen spikes in sales since Election Day. My Patriot Supply, an Idaho-based emergency supplies company, doubled its online sales during the week of Inauguration Day compared to the same week in 2016, marketing VP Keith Bansemer tells Business Insider.In the three months leading up to Election Day, it also experienced triple the normal amount of sales. The company handles online orders from both blue and red states in rural and urban areas. But there has been a huge sales surge in cities since the election, including Boston, St. Louis, and Dallas, where customers often express worry that they won't be able to reach a grocery store during a crisis. Recently, My Patriot Supply's most popular items have been two-week and four-week food kits as well as water filtration systems. The food kits — which contain comfort foods like pizza and soups are customer favorites — don't expire for 20 years. Doomsday Prep, which has a storefront in Georgia, also noticed increases in online orders around Election Day and Inauguration Day, owner David Sanders tells BI. Since the election, it has seen more than a 15% growth in year-over-year sales, especially in products like pre-packaged meals, first aid kits, and evacuation bags. Trump's election has caused some to feel more fear according to Bansemer, which he believes has persuaded more people to start prepping. View More>>